Review notes app safety features

With the review notes app we'll occasionally have moments where internet connectivity is an issue, or there'll be a page error when submit is clicked (and we can't get it to submit at all), or maybe shotgun is down for maintenance...

The problem is that if waiting around for a resolution isn't an option - You can be left with the choice of leaving the computer/laptop on until the next day... or shutting it down and risking loosing everything when the browser is closed.

It'd be nice to be able to save your hours of notes to CSV or some other output file, so can be safely stored on the local machine and you can upload them later (or transfer the file to another machine and try there), that way no work has been lost. It would give users a safety net of at least knowing their notes are safe and can be uploaded, even if not immediately.